get-jail-info

gistfile1.c

#include <sys/param.h>
#include <sys/jail.h>
#include <sys/uio.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <jail.h>
#include <stdio.h>

int
main(void)
{
    struct iovec params[6];
    struct in_addr ia;

    char hostbuf[MAXHOSTNAMELEN];
    int lastjid = 0;

    *(const void **)&params[0].iov_base = "lastjid";
    params[0].iov_len  = sizeof("lastjid");
    params[1].iov_base = &lastjid;
    params[1].iov_len = sizeof(lastjid);

    *(const void **)&params[2].iov_base = "host.hostname";
    params[2].iov_len = sizeof("host.hostname");
    params[3].iov_base = hostbuf;
    params[3].iov_len = MAXHOSTNAMELEN;

    *(const void **)&params[4].iov_base = "ip4.addr";
    params[4].iov_len = sizeof("ip4.addr");
    params[5].iov_len = sizeof(struct in_addr);
    params[5].iov_base = &ia;

    while ((lastjid = jail_get(params, 6, 0)) > 0) {
        printf("JID: %d\n", lastjid);
        printf("\thost.hostname: %s\n", hostbuf);
        printf("\tip4.addr: %s\n", inet_ntoa(ia));
    }

    return(0);
}